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ListBox DataBinding issue in WP 7.5

I recently wrote an app targeting WP 7.1 SDK which uses a ListBox and DataBinds it from code behind. When I run this app on a WP8 device or a WP8 emulator, the app works fine and I can see the data on the page. But when this exact same app is run on a WP7.5 device or emulator, the ListBox does not show any data. I have not been able to figure out why for the life of me!

'events' is an object of a class, and I have verified that it does contain all the right data at this point. When this code is run on a WP7.5 device the ListBox shows up empty even though it is bound with actual data, but when this exact code is run on a WP8 device it shows the data perfectly fine.

Just for testing sake I hardcoded one of the TextBlocks inside the ListBox with a value, like: